Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value $ 601 $ 520
Loans and leases, fair value 175 185
Fair Value, Measurements, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 601 520
Fair Value, Measurements, Recurring | Mortgages Held For Sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, aggregate unpaid principal 598 513
Difference 3 7
Fair Value, Measurements, Recurring | Mortgages Held To Maturity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 175 185
Loans held for investment, aggregate unpaid principal 185 190
Difference (10) (5)
Fair Value, Measurements, Recurring | 90 or  more days | Mortgages Held For Sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, fair value 0 0
Loans held for sale, aggregate unpaid principal 0 0
Difference 0 0
Fair Value, Measurements, Recurring | 90 or  more days | Mortgages Held To Maturity    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans and leases, fair value 3 11
Loans held for investment, aggregate unpaid principal 3 11
Difference $ 0 $ 0